That’s not how nozzle wear works.. this is from over aggressive nozzle wiping g.code, z distance from bed too close, ironing at super high speeds, and layer heights not supported by the nozzle geometry.
How would an abrasive filament sand the OUTSIDE edge of the nozzle flat?
Comment didn't go with this, but here's two prints. Brass nozzle and steel nozzle. You can see under extrusion on both, moreso in brass, as part progresses.